Contribution to the Study of the Fishes of Ungava Bay

1952 ◽  
Vol 9 (2) ◽  
pp. 83-128 ◽  
Author(s):  
M. J. Dunbar ◽  
H. H. Hildebrand

The aquatic environment of the Ungava Bay area and watershed is described. Forty-four species of fishes are recorded, belonging to twenty-one families. Twenty-nine are marine forms, two are anadromous, and thirteen are predominantly or entirely freshwater forms. Seventeen are new records for Ungava Bay, and a few are new for the whole of the Canadian Eastern Arctic. The marine piscine fauna is shown to be in the main subarctic, containing such arctic-subarctic forms as Salvelinus alpinus, Reinhardtius hippoglossoidès, Gymnocanthus tricuspis, Icelus bicornis, Aspidophoroides olriki, Lumpenus fabricii, etc., and subarctic-boreal species such as Salmo solar, Gadus callarias, Sebastes marinus, Liparis atlanticus and Mallotus villosus. More strictly arctic species in the fauna are Boreogadus saida, Triglops nybelini and Oncocottus quadricornis; there are two Atlantic boreal species recorded, Faralepis rissoi kröyeri and Lampanyctus crocodilus, and the remainder are fishes of wide north-south range, found in all three zones (arctic, subarctic, boreal), such as Somniosus microcephalus, Myctophum glaciale, Ammodytes dubius, Triglops pingeli, Eumicrotremus spinosus, Liparis tunicatus, Lumpenus maculatus, Lycodes reticulatus.

ARCTIC ◽  
2016 ◽  
Vol 69 (3) ◽  
pp. 231
Author(s):  
Les N. Harris ◽  
David A. Bogsuski ◽  
Colin P. Gallagher ◽  
Kimberly L. Howland

Where anadromous fishes occur in the Canadian Arctic, they provide the mainstay of local subsistence fisheries of varying intensities. Many of these fisheries harvest a mixture of stocks at discrete locations and it is often not known which stocks, specifically, are being harvested and to what extent. In the Darnley Bay area of the Northwest Territories, Arctic char, Salvelinus alpinus, in particular have long provided an important subsistence resource to residents of Paulatuk, and char from two systems (the Hornaday and Brock Rivers) are thought to contribute to the coastal fishery for this species. Genetic mixed-stock analysis (GMA) is routinely applied for resolving stock contributions to such fisheries, yet studies incorporating GMA to understand specifically which stocks are being harvested in the Canadian Arctic, and to what extent, are relatively scarce. In this study, we assayed microsatellite DNA variation among 987 Arctic char from two important coastal subsistence fisheries and several inland sampling locations in the Darnley Bay area to (1) assess the degree of genetic structuring between the Hornaday and Brock Rivers and (2) resolve the proportional contributions of these stocks to coastal mixed-stock fisheries in the region using GMA. Overall, genetic differentiation was relatively high and significant (θ = 0.117; 95% C.I. = 0.097–0.142) among baseline sampling locations. Overall patterns of genetic stock structure also support previous hypotheses that additional life history types (e.g., landlocked or freshwater-resident char, or both) exist in the Hornaday system, as indicated by elevated levels of genetic differentiation between some of our sampling locations. The GMA suggested that, while both river systems contribute to the coastal fishery, catches were dominated by Arctic char from the Hornaday River, which highlights the importance of this system. All told, our results may be relevant to the management of the subsistence fishery in Darnley Bay and for furthering the collective understanding of char biodiversity and life history variation in the Canadian Arctic.


PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10536
Author(s):  
Margaret H. Folkins ◽  
Scott M. Grant ◽  
Philip Walsh

High incidental catches of Greenland shark (Somniosus microcephalus) in Nunavut’s Greenland halibut (Reinhardtius hippoglossoides) fishery has led to studies on the feasibility of capturing Greenland halibut with baited pots. In this study, catch rates among six experimental pots are compared. In addition to this, underwater video observations of Greenland halibut interacting with two of these experimental pot types are quantified in order to help provide recommendations on future pot designs. Catch rates of Greenland halibut differed among pots with different entrance mesh types, and none of the pots produced substantial amounts of bycatch. Strings of pots were deployed within a narrow corridor between baited gillnets targeting Greenland halibut, which may have affected catch results. Video observations revealed Greenland halibut entangled by their teeth significantly more often in entrance funnels constructed with 50 mm than with 19 mm clear monofilament netting and the entrance rate was 45% higher with the 19 mm netting. Greenland halibut that successfully entered a pot repeatedly became entangled by their teeth in 58 mm netting used in the side and end panels and in a horizontal panel used to separate the pot into a lower and upper chamber. The majority (80%) of Greenland halibut were observed to approach a pot against the current. The downstream entrance was aligned with the current in 52% of the observed Greenland halibut approaches. Seventy percent of entry attempts and 67% of successful entries occurred when fish approached against the current and when the entrance was aligned with the current. These observations lead to recommendations that future studies consider developing a four entrance pot to ensure an entrance is always aligned with bottom currents. Based on these observations of entanglements, it is recommended to use 19 mm clear monofilament netting in the entrance funnel, 100 mm polyethylene netting in the exterior panels, and 19 mm polypropylene netting in the horizontal panel when targeting Greenland halibut. Three Greenland sharks were observed interacting with the pots in the video sets, but none were captured or damaged the pots during the potting experiments, providing validity to the use of pots to mitigate the capture of Greenland shark in Nunavut territorial waters.


Karstenia ◽  
2021 ◽  
pp. 55-69
Author(s):  
Katri Kokkonen

Abstract: Three hemiboreal or boreal species of <em>Entoloma</em> subg. <em>Rhodopolia</em>, <em>E. fluviale</em>, <em>E. quercetorum</em> and <em>E. uvidicola</em>, are described as new based on molecular and morphological data. <em>Entoloma nidorosum</em> is neotypified. New records of <em>E. boreale</em>, <em>E. caeruleopolitum</em>, <em>E. holmvassdalenense</em>, <em>E. lupinum</em>, <em>E. paragaudatum</em>, <em>E. pseudoconferendum</em>, <em>E. radicipes</em>, <em>E. rhodopolium</em> and <em>E. sphagneti</em> are presented from Finland and Sweden with ecological and morphological notices.


2018 ◽  
Vol 87 (2) ◽  
pp. 75-85 ◽  
Author(s):  
Cleopatra M. Loza ◽  
Oliver Reutimann ◽  
Marcelo R. Sánchez-Villagra ◽  
Alfredo A. Carlini ◽  
Gabriel Aguirre-Fernández

The systematic value of the middle-ear ossicles, in particular the malleus, has been long recognized for diverse groups. We present systematic work on the characters of the middle-ear ossicles of pinnipeds, focusing on until now poorly studied Southern Hemisphere species. Mallei were extracted from 16 specimens of pinnipeds belonging to five austral and one boreal species of Phocidae and two austral species of Otariidae. Several characters used in this study have been described previously, and some were here modified. Three new characters are here defined and analysed. All characters were mapped onto the phylogeny. Our character analysis shows the transformations that have occurred in the evolution of middle ear ossicles in pinnipeds and identifies diagnostic features of many of its clades. Beyond the identification of specific changes within eachclade, our study of pinniped ossicle evolution documents the occurrence of anatomical convergences with other groups of mammals that live in an aquatic environment, as has occurred in other organ systems as well.


1981 ◽  
Vol 59 (12) ◽  
pp. 2360-2364 ◽  
Author(s):  
G. F. Rogers ◽  
J. C. Roff ◽  
D. H. Lynn

Tintinnids were numerically dominant in plankton samples collected from Chesterfield Inlet, Northwest Territories, in September 1978. Thirteen species were identified, 11 of which are new records for the Hudson Bay area. Tintinnopsis fimbriata and T. angusta were the most numerous tintinnids in the upper estuary at salinities below 24‰; their cell numbers were significantly positively correlated to temperature. Parafavella denticulata was the most abundant species in marine waters but it penetrated the estuary to salinities as low as 4‰. Cell numbers and volumes of P. denticulata were significantly positively correlated to salinity and negatively to chlorophyll; this species appeared to act as an almost conservative indicator of marine influence in this estuary. The distributions of the two Tintinnopsis species were not so readily explained, but maximum numbers of T. fimbriata and T. angusta corresponded to a phytoplankton maximum at station 29 in the middle estuary.


ZooKeys ◽  
2020 ◽  
Vol 969 ◽  
pp. 1-22
Author(s):  
Guido Bonello ◽  
Marco Grillo ◽  
Matteo Cecchetto ◽  
Marina Giallain ◽  
Antonia Granata ◽  
...  

Distributional data on planktic copepods (Crustacea, Copepoda) collected in the framework of the IIIrd, Vth, and Xth Expeditions of the Italian National Antarctic Program (PNRA) to the Ross Sea sector from 1987 to 1995 are here provided. Sampling was performed with BIONESS and WP2 nets at 94 sampling stations at depths of 0–1,000 m, with a special focus on the Terra Nova Bay area. Altogether, this dataset comprises 6,027 distributional records, out of which 5,306 were obtained by digitizing original data reports and 721 are based on physical museum vouchers curated by the Italian National Antarctic Museum (MNA, Section of Genoa). The MNA samples include 8,224 individual specimens that were identified to the lowest possible taxonomic level. They belong to four orders, 25 families, 52 genera, and 82 morphological units (out of which 17 could be determined at the genus level only). A variety of environmental data were also recorded at each of the sampling stations, and we report original abundances (ind/m3) to enable future species distribution modelling. From a biogeographic point of view, the distributional data here reported represented new records for the Global Biogeographic Information Facility (GBIF) registry. In particular, 62% of the total number of species are new records for the Ross Sea sector and another 28% new records for the Antarctic region.


1969 ◽  
Vol 47 (6) ◽  
pp. 859-862 ◽  
Author(s):  
Yutaka Suda ◽  
G. W. Argus

Chromosome numbers are reported for 12 native North American species of Salix and one natural hybrid. The arctic species Salix alaxensis var. alaxensis, S. fuscescens, S. ovalifolia var. ovalifolia, S. phlebophylla, and S. reticulata and the boreal species S. arbusculoides are diploids, 2n = 38. Tetraploid counts, 2n = 76, are reported for the arctic S. planifolia ssp. pulchra. Taxa with more than one chromosome number include S. planifolia ssp. planifolia and S. pedicellaris, each of which has tetraploid and triploid levels; S. arctica s.l., which is tetraploid in the eastern American arctic and hexaploid in the Alaska and Eurasian arctic; and S. athabascensis with triploid, tetraploid, and hexaploid levels. Intra-population variation in chromosome number is reported for S. glauca in which tetraploids, pentaploids, and hexaploids occur in a single Alaskan population.


1981 ◽  
Vol 38 (3) ◽  
pp. 257-267 ◽  
Author(s):  
J-P. Vesin ◽  
W. C. Leggett ◽  
K. W. Able

The feeding ecology of juvenile (< 140 mm TL) and adult (> 140 mm TL) capelin (Mallotus villosus) in the St. Lawrence River Estuary and western Gulf of St. Lawrence was studied between October 1974 and October 1975. Both juveniles and adults fed almost exclusively on zooplankton. Three prey totally dominated the diet. Copepods were numerically most abundant but euphausiids were dominant in terms of biomass. Appendicularians ranked third in both number and biomass. This differed from the diet of capelin in the Canadian Atlantic only to the extent that amphipods replace appendicularians in the diet in the Atlantic and large copepods are more abundant in the diet there. A shift in diet occurred during growth. Premetamorphic capelin (< 75 mm TL) consumed small prey exclusively: invertebrate eggs, cyclopoid copepods, and diatoms predominated. The diets of juvenile (75–139 mm TL) and adult (> 140 mm TL) capelin overlapped considerably but a pronounced shift from small copepods to adult euphausiids occurred at ~ 140 mm TL. Early morning and evening feeding peaks occurred between May and August. A single midday feeding peak prevailed in October–November. Feeding of adult capelin was active in the spring prior to spawning but virtually ceased during spawning. Juvenile capelin fed actively throughout spring and summer. The daily ration of zooplankton by capelin was estimated to be 5% of wet body weight in summer May–September and ~ 2.5% in October–November. Year-to-year variations in average daily consumption in excess of 100 000 t have occurred between 1972 and 1978 and average daily consumption has declined by up to 310 000 t during the same interval. This significant year-to-year and long-term release of zooplankton from predation by capelin may be an important regulator of changes in year-class strength in other species of the area, notably arctic cod, Boreogadus saida and short-finned squid, Illex illecebrosus.Key words: capelin, Mallotus villosus; Gulf of St. Lawrence, ecology, food habits, daily ration, estuaries, zooplankton, multispecies interactions, arctic cod, Boreogadus saida; squid, Illex illecebrosus


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